Both companies will hope this goes some way to combat the rise in popularity of Apple's Siri, Google Assistant or Samsung's Bixby.

"The world is big and so multifaceted. There are going to be multiple successful intelligent agents, each with access to different sets of data and with different specialised skill areas. Together, their strengths will complement each other and provide customers with a richer and even more helpful experience," said Amazon's CEO, Jeff Bezos.

"It's great for Echo owners to get easy access to Cortana."

It could even mean that Xbox One owners will gain access to Alexa too, but we're waiting to hear whether that's the case.